In music, what is the term that means a great deal or a lot?

The term that means "a great deal" or "a lot" in music is "molto." This Italian word is often used as a directive in musical scores to indicate that a particular dynamic, tempo, or expression should be performed with considerable intensity or extent. For example, a composer might write "molto allegro," which indicates that the piece should be played very fast.

The other terms have different meanings: "non" typically means "not" or "without" in musical context, "pesante" refers to a heavy or ponderous style of playing, and "morendo" signifies a gradual decrease in volume or intensity, often leading to a quiet or fading conclusion. Understanding these terms helps musicians interpret a composer's intentions more accurately and enhances the overall performance.